Zig

Get IMAP Attachment Filenames

Demonstrates the Chilkat Imap.GetMailAttachFilename method, which returns the filename of an attachment. The first argument is the Email and the second is the zero-based attachment index. This example fetches only the message headers and lists the attachment filenames.

Background: This method reads the filename from ckx-imap-* metadata, so it works on a header-only email even though the attachment bodies have not been downloaded. That is exactly what a mail client needs to render the paperclip list — the names of the attached files — before the user decides to download any of them.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the Imap.GetMailAttachFilename method, which returns the filename of an
    // attachment.  The 1st argument is the Email and the 2nd is the zero-based attachment index.

    const imap = try chilkat.Imap.init();
    defer imap.deinit();

    imap.setSsl(true);
    imap.setPort(993);

    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.login("user@example.com", "myPassword") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.selectMailbox("Inbox") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    // metadata describing the attachments is present, so the attachment info methods still work.
    const headers_only = true;
    const use_uid = false;
    const seq_num = 1;
    const email = try chilkat.Email.init();
    defer email.deinit();
    imap.fetchEmail(headers_only, @as(u32, @intCast(seq_num)), use_uid, email) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Loop over the attachments and print each filename.
    const num_attach = imap.getMailNumAttach(email);
    std.debug.print("Attachments: {d}\n", .{num_attach});
    var i: i32 = 0;
    i = 0;
    while (i < num_attach) : (i += 1) {
        // GetMailAttachFilename returns a string, so assign it to a string variable.
        const fname = imap.getMailAttachFilename(alloc, email, i) catch {
            std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
            return;
        };

        std.debug.print("{s}\n", .{fname});
    }

    imap.disconnect() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };
}